openssl/test/dtlstest.c

/*
 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

#include "ssltestlib.h"
#include "testutil.h"

static char *cert = NULL;
static char *privkey = NULL;
static unsigned int timer_cb_count;

#define NUM_TESTS   2


#define DUMMY_CERT_STATUS_LEN  12

static unsigned char certstatus[] = {
    SSL3_RT_HANDSHAKE, /* Content type */
    0xfe, 0xfd, /* Record version */
    0, 1, /* Epoch */
    0, 0, 0, 0, 0, 0x0f, /* Record sequence number */
    0, DTLS1_HM_HEADER_LENGTH + DUMMY_CERT_STATUS_LEN - 2,
    SSL3_MT_CERTIFICATE_STATUS, /* Cert Status handshake message type */
    0, 0, DUMMY_CERT_STATUS_LEN, /* Message len */
    0, 5, /* Message sequence */
    0, 0, 0, /* Fragment offset */
    0, 0, DUMMY_CERT_STATUS_LEN - 2, /* Fragment len */
    0x80, 0x80, 0x80, 0x80, 0x80,
    0x80, 0x80, 0x80, 0x80, 0x80 /* Dummy data */
};

#define RECORD_SEQUENCE 10

static unsigned int timer_cb(SSL *s, unsigned int timer_us)
{
    ++timer_cb_count;

    if (timer_us == 0)
        return 1000000;
    else
        return 2 * timer_us;
}

static int test_dtls_unprocessed(int testidx)
{
    SSL_CTX *sctx = NULL, *cctx = NULL;
    SSL *serverssl1 = NULL, *clientssl1 = NULL;
    BIO *c_to_s_fbio, *c_to_s_mempacket;
    int testresult = 0;

    timer_cb_count = 0;

    if (!TEST_true(create_ssl_ctx_pair(DTLS_server_method(),
                                       DTLS_client_method(),
                                       DTLS1_VERSION, DTLS_MAX_VERSION,
                                       &sctx, &cctx, cert, privkey)))
        return 0;

    if (!TEST_true(SSL_CTX_set_cipher_list(cctx, "AES128-SHA")))
        goto end;

    c_to_s_fbio = BIO_new(bio_f_tls_dump_filter());
    if (!TEST_ptr(c_to_s_fbio))
        goto end;

    /* BIO is freed by create_ssl_connection on error */
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl1, &clientssl1,
                                      NULL, c_to_s_fbio)))
        goto end;

    DTLS_set_timer_cb(clientssl1, timer_cb);

    if (testidx == 1)
        certstatus[RECORD_SEQUENCE] = 0xff;

    /*
     * Inject a dummy record from the next epoch. In test 0, this should never
     * get used because the message sequence number is too big. In test 1 we set
     * the record sequence number to be way off in the future. This should not
     * have an impact on the record replay protection because the record should
     * be dropped before it is marked as arrived
     */
    c_to_s_mempacket = SSL_get_wbio(clientssl1);
    c_to_s_mempacket = BIO_next(c_to_s_mempacket);
    mempacket_test_inject(c_to_s_mempacket, (char *)certstatus,
                          sizeof(certstatus), 1, INJECT_PACKET_IGNORE_REC_SEQ);

    if (!TEST_true(create_ssl_connection(serverssl1, clientssl1,
                                         SSL_ERROR_NONE)))
        goto end;

    if (timer_cb_count == 0) {
        printf("timer_callback was not called.\n");
        goto end;
    }

    testresult = 1;
 end:
    SSL_free(serverssl1);
    SSL_free(clientssl1);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);

    return testresult;
}

int setup_tests(void)
{
    if (!TEST_ptr(cert = test_get_argument(0))
            || !TEST_ptr(privkey = test_get_argument(1)))
        return 0;

    ADD_ALL_TESTS(test_dtls_unprocessed, NUM_TESTS);
    return 1;
}

void cleanup_tests(void)
{
    bio_f_tls_dump_filter_free();
    bio_s_mempacket_test_free();
}